The video starts off focused on one person alone in a crowd of a bunch of people talking to one another. The alone person seems unhappy and sad because she has no one to talk too. She walks around from class to class all alone. She is seemed to gloomy as she eats lunch by herself.
The lone person comes across another lonely girl in the library. They start joking around and talking about silly things such as their math teacher's fingers. Soon they become closer and closer friends, eventually calling each other their BFFs.
The same best friends grow up together. They're still friends from high school. They have helped each other grow into successful adults. They helped each other become better people and from high school to adults they have grown as people.